<template>
   <div>
      <!-- 面包屑导航区区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>权限管理</el-breadcrumb-item>
         <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图 -->
      <el-card>
         <!-- 添加角色按钮区 -->
         <el-row>
            <el-col>
               <el-button type="primary">添加角色</el-button>
            </el-col>
         </el-row>

         <!-- 角色列表区域 -->
         <el-table :data="rolelist" stripe border>
            <!-- 展开列 -->
            <el-table-column type="expand">
               <template v-slot="scope">
                  <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                     v-for="(item1, i1) in scope.row.children" :key="item1.id">

                     <!-- 一级权限渲染 -->
                     <el-col :span="5">
                        <el-tag @close="removeRightById(scope.row, item1.id)" closable> {{ item1.authName }} </el-tag>
                        <i class="el-icon-caret-right"></i>
                     </el-col>
                     <!-- 渲染二级和三级权限 -->
                     <el-col :span="19">
                        <!-- 通过for循环嵌套渲染二级权限 -->
                        <el-row :class="[i2 === 0 ? '0' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children"
                           :key="item2.id">
                           <el-col :span="6">
                              <el-tag type="success" @close="removeRightById(scope.row, item2.id)" closable>{{
                                    item2.authName
                              }}</el-tag>
                              <i class="el-icon-caret-right"></i>
                           </el-col>
                           <el-col :span="18">
                              <!-- 通过for循环嵌套渲染三级权限 -->
                              <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable
                                 @close="removeRightById(scope.row, item3.id)">
                                 {{ item3.authName }}
                              </el-tag>
                           </el-col>
                        </el-row>
                     </el-col>
                  </el-row>
                  <!-- <pre>
                   {{ scope.row }}
               </pre> -->
               </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label='操作' width="300px">
               <template v-slot="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete">删除 </el-button>
                  <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">
                     分配权限
                  </el-button>
               </template>
            </el-table-column>
         </el-table>
      </el-card>

      <!-- 分配权限的对话框 -->
      <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
         <!-- 树形控件 -->
         <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all
            :default-checked-keys="defKeys" ref="treeRef"></el-tree>
         <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
         </span>
      </el-dialog>
   </div>
</template>

<script>
export default {
   name: 'Roles',
   data() {
      return {
         // 所有角色列表数据
         rolelist: [],
         // 控制分配权限对话框的显示与隐藏
         setRightDialogVisible: false,
         // 所有权限的数据
         rightslist: [],
         // 树形控件的属性绑定对象
         treeProps: {
            label: 'authName',
            children: 'children',
         },
         // 默认选中的节点Id值
         defKeys: [],
         // 当前即将分配角色权限的id
         roleId: ''
      }
   },
   methods: {
      // 获取所有角色的列表
      async getRolesList() {
         const { data: res } = await this.$http.get('roles')
         if (res.meta.status !== 200) {
            return this.$message.error('获取角色列表失败！')
         }
         this.rolelist = res.data
         // console.log(this.rolelist);
      },
      // 根据id删除对应的的权限
      async removeRightById(role, rightId) {
         // 弹框提示用户是否删除
         const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
         }).catch(error => error)

         if (confirmResult !== 'confirm') {
            return this.$message.info('取消了删除')
         }
         const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
         if (res.meta.status !== 200) {
            return this.$message.error('删除权限失败！')
         }
         // this.getRolesList()
         role.children = res.data
      },
      // 展示分配权限的对话框
      async showSetRightDialog(role) {
         this.roleId = role.id
         // 获取所有权限的数据
         const { data: res } = await this.$http.get('rights/tree')
         if (res.meta.status !== 200) {
            return this.$message.error('获取权限数据失败!')
         }
         // 把获取到的权限数据保存到data中
         this.rightslist = res.data
         console.log(this.rightslist);

         // 递归获取三级节点的Id
         this.getLeafKeys(role, this.defKeys)

         this.setRightDialogVisible = true
      },
      // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
      getLeafKeys(node, arr) {
         // 如果当前node节点不包含children则是三级节点
         if (!node.children) {
            return arr.push(node.id)
         }
         node.children.forEach(item => {
            this.getLeafKeys(item, arr)
         })
      },
      // 监听分配权限对话框的关闭事件
      setRightDialogClosed() {
         this.defKeys = []
      },
      // 点击为角色分配权限
      async allotRights() {
         const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys(),]
         const idStr = keys.join(',')
         const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
         if (res.meta.status !== 200) {
            return this.$message.error('分配权限失败!')
         }
         this.$message.success('分配权限成功!')
         this.getRolesList()
         this.setRightDialogVisible = false
      }
   },
   created() {
      this.getRolesList()
   },
}
</script>

<style lang="less" scoped>
.el-tag {
   margin: 7px;
}

.bdtop {
   border-top: 1px solid #eee;
}

.bdbottom {
   border-bottom: 1px solid #eee;
}

.vcenter {
   display: flex;
   align-items: center;
}
</style>